<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
      <!-- 警告区域 -->
      <el-alert
        title="注意:  只允许为第三级分类设置相关参数!"
        type="warning"
        show-icon
      ></el-alert>

      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类:</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            v-model="selectedCateKeys"
            :options="cateList"
            :props="{
              expandTrigger: 'hover',
              value: 'cat_id',
              label: 'cat_name',
              children: 'children',
            }"
            @change="handleChange"
          ></el-cascader>
        </el-col>
      </el-row>

      <!-- tab 页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数的面板   -->
        <el-tab-pane label="动态参数" name="many">
          <!-- 添加参数的按钮 -->
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true"
            >添加参数</el-button
          >
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
                <template slot-scope="scope">
                    <!-- 循环渲染Tag标签 -->
                    <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                    <!-- 输入的文本框 -->
                    <el-input
                    class="input-new-tag"
                    v-if="scope.row.inputVisible"
                    v-model="scope.row.inputValue"
                    ref="saveTagInput"
                    size="small"
                    @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm(scope.row)"
                    >
                    </el-input>
                    <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                </template>
            </el-table-column>
            <!-- 索引行 -->
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column
              label="参数名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                  <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)"
                    >修改</el-button
                >
                <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)"
                    >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>

        <!-- 添加静态属性的面板   -->
        <el-tab-pane label="静态属性" name="only">
          <!-- 添加属性的按钮 -->
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true"
            >添加属性</el-button
          >
          <!-- 静态属性表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
                <template slot-scope="scope">
                    <!-- 循环渲染Tag标签 -->
                    <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                    <!-- 输入的文本框 -->
                    <el-input
                    class="input-new-tag"
                    v-if="scope.row.inputVisible"
                    v-model="scope.row.inputValue"
                    ref="saveTagInput"
                    size="small"
                    @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm(scope.row)"
                    >
                    </el-input>
                    <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                </template>
            </el-table-column>
            <!-- 索引行 -->
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column
              label="属性名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
                <template slot-scope="scope">
                    <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)"
                        >修改</el-button
                    >
                    <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)"
                        >删除</el-button
                    >
                </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加的对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <!-- 添加表单 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams"
          >确 定</el-button
        >
      </span>
    </el-dialog>

    <!-- 修改的对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
    >
      <!-- 修改表单 -->
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams"
          >确 定</el-button
        >
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  created() {
    this.getCateList()
  },
  data() {
    return {
      // 商品分类列表
      cateList: [],
      // 级联选择框双向绑定到的数组
      selectedCateKeys: [],
      // 被激活的页签的名称
      activeName: 'many',
      // 动态参数的数据
      manyTableData: [],
      // 静态属性的数据
      onlyTableData: [],
      // 控制添加对话框的显示与隐藏
      addDialogVisible: false,
      // 添加的表单数据对象
      addForm: {
          attr_name: ''
      },
      // 添加表单的验证规则对象
      addFormRules: {
          attr_name: [
              {required: true, message: '请输入名称', trigger: 'blur'}
          ]
      },
      // 控制修改对话框的显示与隐藏
      editDialogVisible: false,
      // 修改的表单数据对象
      editForm: {
          attr_name: '',
          attr_id: 0
      },
      // 修改表单的验证规则对象
      editFormRules: {
          attr_name: [
              {required: true, message: '请输入名称', trigger: 'blur'}
          ]
      },
    }
  },
  methods: {
    // 获取所有的商品分类列表
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败!')
      }
      this.cateList = res.data
    },
    // 级联选择框选中项变化,会触发这个函数
    handleChange() {
      this.getParamsData()
    },
    // tab 页签点击事件的处理函数
    handleTabClick() {
      this.getParamsData()
    },
    // 获取参数的列表数据
    async getParamsData() {
      // 证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }

      // 证明选中的是三级分类
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        { params: { sel: this.activeName } }
      )

      res.data.forEach(item => {
          item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
          // 文本输入框的展示
          item.inputVisible = false
          // 文本输入框的内容
          item.inputValue = ''
      })

      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败')
      }

      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // 监听添加对话框的关闭事件
    addDialogClosed() {
        this.$refs.addFormRef.resetFields()
    },
    // 点击按钮,添加参数
    addParams() {
        this.$refs.addFormRef.validate(async valid => {
            if(!valid) return 
            const {data: res} = await this.$http.post(`categories/${this.cateId}/attributes`, {attr_name: this.addForm.attr_name, attr_sel: this.activeName})
            if(res.meta.status !== 201) {
                return this.$message.error('添加失败!')
            }
            this.$message.success('添加成功!')
            this.addDialogVisible = false
            this.getParamsData()
        })
    },
    // 点击按钮,展示修改的对话框
    async showEditDialog(attr_id) {
        // 查询当前参数的信息
        const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`, {params: {attr_sel: this.activeName}})
        if(res.meta.status !== 200) {
            return this.$message.error('获取参数失败!')
        }
        this.editForm = res.data
        this.editDialogVisible = true
    },
    // 点击按钮,修改参数
    editParams() {
        this.$refs.editFormRef.validate(async valid => {
            if(!valid) return

            const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {attr_name: this.editForm.attr_name, attr_sel: this.activeName})
            if(res.meta.status !== 200) {
                return this.$message.error('修改失败!')
            }
            
            this.$message.success('修改成功!')
            this.getParamsData()
            this.editDialogVisible = false
        })
    },
    // 监听修改对话框的关闭事件
    editDialogClosed() {
        this.$refs.editFormRef.resetFields()
    },
    // 根据id删除参数
    async removeParams(attr_id) {
        const confirmResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => err)

        if(confirmResult === 'cancel'){
            return this.$message.info('已取消删除!')
        }

        const {data: res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
        if(res.meta.status !== 200) {
            return this.$message.error('删除失败!')
        }

        this.$message.success('删除成功!')
        this.getParamsData()
    },
    // 文本框失去焦点,或按下了Enter都会触发
    handleInputConfirm(row) {
        if(row.inputValue.trim().length === 0) {
            row.inputValue = ''
            row.inputVisible = false
            return
        }

        // 如果没有return, 则证明输入的内容,需要做后续处理
        row.attr_vals.push(row.inputValue.trim())
        row.inputValue = ''
        row.inputVisible = false

        this.saveAttrVals(row)

        

    },
    // 将对 attr_vals 的操作,保存到数据库
    async saveAttrVals(row) {
        // 需要发起请求, 保存这次操作
        const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {attr_name: row.attr_name, attr_sel: row.attr_sel, attr_vals: row.attr_vals.join(' ')})
        if(res.meta.status !== 200) {
            return this.$message.error('修改参数项失败')
        }

        this.$message.success('修改参数项成功')
    },
    // 点击按钮, 展示文本输入框
    showInput(row) {
        row.inputVisible = true
        // 让文本框自动获得焦点
        // $nextTick 方法的作用,就是当页面上元素被重新渲染之后,才会执行回调函数中的代码
        this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus();
        });
    },
    // 删除对应的参数可选项
    handleClose(i, row) {
        row.attr_vals.splice(i, 1)
        this.saveAttrVals(row)

    }
  },
  computed: {
    // 如果按钮需要被禁用,则返回true,否则返回false
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    // 当前选中的三级分类的Id
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    // 动态计算标题的文本
    titleText() {
        if(this.activeName === 'many') {
            return '动态参数'
        }else {
            return '静态属性'
        }
    },
  },
}
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px;
}

.el-tag {
    margin: 8px;
}

.input-new-tag {
    width: 150px;
}
</style>
